US6330438B1 - Audible warning prior to losing cell call in progress - Google Patents
Audible warning prior to losing cell call in progress Download PDFInfo
- Publication number
- US6330438B1 US6330438B1 US09/408,877 US40887799A US6330438B1 US 6330438 B1 US6330438 B1 US 6330438B1 US 40887799 A US40887799 A US 40887799A US 6330438 B1 US6330438 B1 US 6330438B1
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- mobile unit
- cell site
- call
- tone
- providing
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- 230000001413 cellular effect Effects 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 9
- 230000004044 response Effects 0.000 claims description 7
- 238000004891 communication Methods 0.000 abstract description 20
- 238000010586 diagram Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 3
- 230000005236 sound signal Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
- H04W36/304—Reselection being triggered by specific parameters by measured or perceived connection quality data due to measured or perceived resources with higher communication quality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/23—Indication means, e.g. displays, alarms, audible means
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
- H04M1/724—User interfaces specially adapted for cordless or mobile telephones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/042—Public Land Mobile systems, e.g. cellular systems
Definitions
- This invention relates generally to cellular telephone systems and is particularly directed to providing a cellular telephone user with an audible indication of low signal strength of a call in progress to allow the user to take precautionary steps to avoid loss of the call.
- FIG. 1 shows cell sites A, B and C in the cellular telephone network 10 .
- the MSC 16 is connected by wire to a Public Switched Telephone Network (PSTN) 14 shown in dotted line form in the figure.
- PSTN 14 typically includes a large number of fixed telephones 12 for placing and receiving calls.
- the MSC 16 interfaces with the PSTN 14 and the cell sites via control links and voice trunks.
- the MSC 16 is also involved with switching calls between different cell sites in real time as the mobile unit 18 moves from the coverage area of one cell site to another. This process is known as a call “handoff” of the mobile unit 18 between adjacent cell sites.
- a call handoff is performed in the following manner.
- the mobile unit 18 is served by cell site A, this cell site determines that the signal from the mobile unit is getting weak.
- Cell site A communicates the weakening of the received signal to the MSC 16 which then prompts neighboring cell sites B and C to measure the signal strength from the mobile unit and report their findings back to cell site A.
- Cell site A selects the best set of neighbor cell sites that can accept the mobile unit 18 and requests a handoff from the MSC 16 .
- the MSC 16 then informs the new cell site B that it is to accept a handoff and directs cell site B to tune to a selected radio channel being used by the mobile unit 18 .
- the MSC 16 directs cell site A to direct the mobile unit 18 to tune to the new voice radio channel.
- the MSC 16 then switches the call from cell site A to cell site B, with the mobile unit 18 re-tuning to the new channel associated with cell site B.
- the procedure described above is followed when a second cell site is available for handing off the mobile unit when the strength of the communications signal is too low to continue the call.
- the present invention addresses this problem by alerting the mobile unit to a dangerously low signal level, allowing the user to take precautionary steps to avoid loss of the call.
- This invention is intended for use in a cellular telephone system and is set into operation when the signal level to a mobile user from a serving cell site is reduced below a predetermined threshold signal level and there is no other cell site within the cellular network to hand the mobile user off to in order to continue the call in progress.
- This invention alerts the mobile user of the impending loss of the call because of the reduced signal level before it occurs and allows the user sufficient time to take precautionary steps to avoid loss of the call.
- Typical precautionary steps would include the user moving or re-orienting the hand-held mobile unit to compensate for the loss of signal strength by improving signal reception.
- An audio signal is provided during the call in progress via the hand-held mobile unit's earpiece to the user to alert the user to take appropriate precautionary steps for maintaining integrity of the communications link.
- the invention makes use of existing circuitry within the hand-held mobile unit to compare the received signal level with a predetermined threshold level and provide an appropriate drive signal to the unit's earpiece for providing an audio signal to the user either in the form of a continuous tone or as a pulsed signal.
- the invention also employs existing communications links between the mobile unit and the cell site.
- FIG. 1 is a simplified schematic diagram of a cellular telephone network in which the present invention is intended for use;
- FIG. 2 is a block diagram showing the communication links between a mobile unit, a cell site, and a mobile switching center in a typical cellular telephone network;
- FIG. 3 is a block diagram of circuitry employed in a mobile unit with which the present invention is intended for use;
- FIG. 4 is a simplified flow diagram illustrating the signals communicated between various elements of a cellular telephone system in accordance with the present invention
- FIG. 5 is a combined block diagram and flow chart illustrating the flow of signals between various components of a cellular telephone system and the steps involved in providing an audible warning to a cellular telephone system user prior to losing a cellular telephone call in progress in accordance with the principles of the present invention.
- the mobile switching center (MSC) 16 is connected to the public switched telephone network (PSTN) 14 by means of a plurality of land lines 22 a , 22 b and 22 c .
- PSTN public switched telephone network
- Communications between the MSC 16 and cell site A, or base station, is by means of a pair of voice circuits 24 and a pair of data links (shown in dotted line form) 26 .
- the voice circuits 24 allow voice communication between the MSC 16 and cell site A in both directions, while the data links 26 allow for control signals to pass in both directions between the MSC and cell site A.
- Cell site A is in communication with the mobile unit 18 via a forward voice channel 28 and a reverse voice channel 30 .
- Communications on the voice channels 28 , 30 are both analog and digital. Communications between cell site A and mobile unit 18 is also by means of forward and reverse setup channels 32 and 34 (shown in the figure in dotted line form). Communications on the setup channels is in digital form. The setup channels allow the mobile unit 18 to access the cellular telephone network.
- the voice channels 28 , 30 are used for voice communication, for handoff of a mobile unit between a pair of cell sites, dynamic power control, and other functions carried out between a cell site and a mobile unit.
- Mobile unit 40 is conventional in design and operation and includes (as shown in dotted line form), a transmitter 42 , a user interface 44 , and a receiver 46 .
- a tone request signal described below is received by the antenna 48 of the mobile unit 40 from the cell site with which the mobile unit is in communication.
- the tone request signal is processed by the mobile unit's receiver 46 for providing an audio tone at the mobile unit's earpiece 50 .
- the audio tone emitted by earpiece 50 alerts a user of the mobile unit 40 that the cellular telephone signal level is reduced and that the communications link will shortly be lost because of the absence of another cell site to hand the call off to. This audio signal alerts the user to take precautionary measures to avoid interruption of the cellular call such as by reorienting or repositioning the mobile unit to increase the received signal strength.
- FIG. 4 there is shown in simplified schematic diagram form a procedure carried out in a cellular telephone network for providing an audible warning prior to losing a cell call in progress in accordance with the present invention.
- elements of the cellular telephone network i.e., cell sites 1 and 2 , an MSC, and a mobile station. Arrows in the figure represent the transmission of signals between the various elements of the network, with the process starting at the top of the figure and continuing over time in proceeding downwardly in the figure.
- cell site 1 determines that the strength of the reverse Traffic Channel (TCH) signal from the mobile station requires the consideration of a handoff of a call to the mobile station from cell site 1 to another cell site.
- TCH Traffic Channel
- Cell site 1 then sends a handoff request to the MSC containing information relevant to the mobile station such as power level, station class mark (SCM), and current reverse TCH signal strength.
- the MSC receives the handoff request and determines which cells are adjacent to cell site 1 .
- cell site 2 is adjacent the MSC.
- the MSC sends a handoff measurement request to cell site 2 as shown in the figure.
- the handoff measurement request includes essentially the same information as that received by the MSC from cell site 1 .
- Cell site 2 receives the handoff measurement request and uses its locating receiver to determine the suitability of handoff.
- the locating receiver in cell site 2 tunes to the reverse TCH frequency the mobile station is currently using, makes signal strength measurements on all (or some) antennas, and determines whether or not the Supervisory Audio Tone (SAT) color code the mobile station is using can be detected.
- Cell site 2 then provides a handoff measurement response and a power level indication to the MSC.
- cell site 2 provides a hand off response to the MSC indicating that a hand off of the call is not possible.
- each cell site 64 is connected to a PTSN 60 by means of a mobile switching center 66 . Details of the communications links between the MSC 66 and the PTSN 60 and cell site 64 as well as with the mobile unit 62 are described with reference to FIG. 2.
- a cell site controller 64 b compares the power level of the received voice signal at step 68 with a predetermined threshold power level.
- the program stored in the cell site's controller 64 b proceeds to step 82 and enables the mobile unit 62 to communicate with the cell site 64 via the cell site's transmitter/receiver 64 a.
- step 70 determines if there is another cell site available to handoff the mobile unit to. If the program determines at step 70 that there is another available cell site for handling the communications of the mobile unit, the program proceeds to step 80 and processes a hand off request message from the mobile unit. If at step 70 it is determined that there is not another cell site available to hand off the mobile unit to, the program proceeds to step 72 and sends a flash intercept message with tone and text to the mobile unit. This signal is provided to the primary radio controller at step 74 and thence to the primary radio cluster controller at step 76 .
- the signal is then provided from the primary radio cluster controller 76 to the mobile unit at step 78 for activating the mobile unit's earpiece for providing an audio tone to the user indicating that the communications signal is below a predetermined alert threshold power level and that communications will be lost unless the user undertakes precautionary steps to either maintain or increase the signal level.
- the MSC sends a Tone Request to cell site 1 which, in turn, relays the Tone Request to the mobile station.
- a database in the cell site is used to determine whether or not a response to the handoff measurement request is warranted.
- An algorithm is used to detect the need for handoff and to detect the probability that the new cell site will be able to sustain the call.
- the database as well as the algorithm used in the cell site for call handoff purposes are not part of the present invention and thus not described further herein.
- tone request signal provided to the mobile station is processed by the mobile station to provide an audio tone from the mobile station's earpiece as previously described.
- Tone request signals are currently provided to telephone receivers, including mobile telephone receivers, for such purposes as providing an audio indication of call waiting.
- Current applications of the use of tone signals provided to a mobile station do not include the use of these types of signals for indicating to a user of the mobile unit of an impending loss of a cellular telephone call as contemplated by the present invention.
Abstract
Description
Claims (7)
Priority Applications (1)
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US09/408,877 US6330438B1 (en) | 1999-09-29 | 1999-09-29 | Audible warning prior to losing cell call in progress |
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US09/408,877 US6330438B1 (en) | 1999-09-29 | 1999-09-29 | Audible warning prior to losing cell call in progress |
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US09/408,877 Expired - Fee Related US6330438B1 (en) | 1999-09-29 | 1999-09-29 | Audible warning prior to losing cell call in progress |
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Cited By (42)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20010026541A1 (en) * | 2000-02-19 | 2001-10-04 | In-Ho You | Method for performing diversity and handoff in all internet protocol network |
US20010028685A1 (en) * | 1999-11-19 | 2001-10-11 | Siemen Information And Communication Mobile Llc | Method and system for power-conserving interference avoidance in communication between a mobile unit and a base unit in a wireless telecommunication system |
US20010046855A1 (en) * | 2000-05-24 | 2001-11-29 | Tae-Young Kil | Method and apparatus for alarming on occurrence of cell secession of a mobile station in a mobile communication system |
US20020042281A1 (en) * | 2000-10-10 | 2002-04-11 | Nec Corporation | Calling system from accessory to portable device |
US20020098816A1 (en) * | 2001-01-23 | 2002-07-25 | Koninklijke Philips Electronics N.V. | Mobile device comprising a GPS receiver |
WO2004017548A3 (en) * | 2002-08-14 | 2004-04-15 | Kataname Inc | System for mobil broadband networking using dynamic quality of service provisioning |
US20040203698A1 (en) * | 2002-04-22 | 2004-10-14 | Intel Corporation | Pre-notification of potential connection loss in wireless local area network |
US20040242218A1 (en) * | 2003-05-29 | 2004-12-02 | Kyocera Corporation | Communication terminal out of range determination method, wireless communication system switching method and communication terminal |
US20050021767A1 (en) * | 2001-08-13 | 2005-01-27 | Hong Cai | Keeping persistency while switching between modalities |
US20050136911A1 (en) * | 2003-12-22 | 2005-06-23 | Samsung Electronics Co., Ltd. | Apparatus and method for mobile station-assisted optimization of a wireless network |
US20050186931A1 (en) * | 2003-09-30 | 2005-08-25 | Nokia Corporation | Receiver module comprising a wideband antenna |
US7015809B1 (en) | 2002-08-14 | 2006-03-21 | Skipper Wireless Inc. | Method and system for providing an active routing antenna |
US20060109825A1 (en) * | 2004-11-19 | 2006-05-25 | Research In Motion Limited | Method and system for predicting service drop in a wireless network |
US20060128450A1 (en) * | 2004-12-10 | 2006-06-15 | Toshiyuki Oda | Portable terminal and portable terminal communication method |
US20060168308A1 (en) * | 2004-11-30 | 2006-07-27 | International Business Machines Corporation | Selective suspension of real time data exchanges for unreliable network connections |
US20080261630A1 (en) * | 2007-04-23 | 2008-10-23 | Research In Motion Limited | Indicating user presence on a messaging network |
EP1986401A1 (en) | 2007-04-23 | 2008-10-29 | Research In Motion Limited | Indicating user presence on a messaging network |
US20080268816A1 (en) * | 2007-04-26 | 2008-10-30 | Research In Motion Limited | Predicting user availability from aggregated signal strength data |
US20090047944A1 (en) * | 2007-08-14 | 2009-02-19 | Johnson Sandra K | Cellular telephone signal monitoring method and system |
US7515544B2 (en) | 2005-07-14 | 2009-04-07 | Tadaaki Chigusa | Method and system for providing location-based addressing |
US20100160784A1 (en) * | 2007-06-01 | 2010-06-24 | Koninklijke Philips Electronics N.V. | Wireless Ultrasound Probe With Audible Indicator |
US7778149B1 (en) | 2006-07-27 | 2010-08-17 | Tadaaki Chigusa | Method and system to providing fast access channel |
US20110151768A1 (en) * | 2009-12-21 | 2011-06-23 | James Snider | Apparatus And Method For Detecting Jamming Of Communications |
US20110151833A1 (en) * | 2009-12-21 | 2011-06-23 | James Snider | Apparatus And Method For Detecting A Cloned Base Station |
US20110151799A1 (en) * | 2009-12-21 | 2011-06-23 | James Snider | Apparatus And Method For Detecting Communication Interference |
US20110151827A1 (en) * | 2009-12-21 | 2011-06-23 | James Snider | Apparatus And Method For Broadcasting The Detection Of RF Jammer Presence |
US20110148713A1 (en) * | 2009-12-21 | 2011-06-23 | D Avello Robert F | Apparatus And Method For Tracking Stolen Vehicles |
US20110151796A1 (en) * | 2009-12-21 | 2011-06-23 | James Walby | Apparatus And Method For Detecting A Cloned Base Station |
US20110151834A1 (en) * | 2009-12-21 | 2011-06-23 | Harsha Dabholkar | Apparatus And Method For Determining An Invalid Base Station |
US20110151795A1 (en) * | 2009-12-21 | 2011-06-23 | D Avello Robert F | Apparatus And Method For Maintaining Communications With A Vehicle In The Presence Of Jamming |
US20110148609A1 (en) * | 2009-12-21 | 2011-06-23 | Harsha Dabholkar | Apparatus And Method For Reducing False Alarms In Stolen Vehicle Tracking |
US20110151791A1 (en) * | 2009-12-21 | 2011-06-23 | James Snider | Apparatus And Method For Maintaining Communication With A Stolen Vehicle Tracking Device |
US20110148610A1 (en) * | 2009-12-21 | 2011-06-23 | James Snider | Apparatus And Method For Compromised Vehicle Tracking |
US20110148712A1 (en) * | 2009-12-21 | 2011-06-23 | Decabooter Steve | Apparatus And Method For Determining Vehicle Location |
US8160096B1 (en) | 2006-12-06 | 2012-04-17 | Tadaaki Chigusa | Method and system for reserving bandwidth in time-division multiplexed networks |
US8305264B1 (en) | 2010-02-03 | 2012-11-06 | Sprint Spectrum L.P. | GPS enhancement for wireless devices |
US8462737B1 (en) * | 2008-06-27 | 2013-06-11 | Research In Motion Limited | System and method for a MIMO split-physical layer scheme for a wireless network |
WO2015047603A1 (en) * | 2013-09-30 | 2015-04-02 | Sony Computer Entertainment Inc | Dropped call warning and prevention methods |
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US9510171B1 (en) | 2012-03-22 | 2016-11-29 | Sprint Spectrum L.P. | Provisioning mobile station with destination communication address during de-registration |
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Cited By (71)
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---|---|---|---|---|
US20010028685A1 (en) * | 1999-11-19 | 2001-10-11 | Siemen Information And Communication Mobile Llc | Method and system for power-conserving interference avoidance in communication between a mobile unit and a base unit in a wireless telecommunication system |
US20010026541A1 (en) * | 2000-02-19 | 2001-10-04 | In-Ho You | Method for performing diversity and handoff in all internet protocol network |
US20010046855A1 (en) * | 2000-05-24 | 2001-11-29 | Tae-Young Kil | Method and apparatus for alarming on occurrence of cell secession of a mobile station in a mobile communication system |
US20020042281A1 (en) * | 2000-10-10 | 2002-04-11 | Nec Corporation | Calling system from accessory to portable device |
US7519377B2 (en) * | 2000-10-10 | 2009-04-14 | Nec Corporation | Calling system from accessory to portable device |
US20020098816A1 (en) * | 2001-01-23 | 2002-07-25 | Koninklijke Philips Electronics N.V. | Mobile device comprising a GPS receiver |
US6992584B2 (en) * | 2001-01-23 | 2006-01-31 | Koninklijke Philips Electronics N.V. | Mobile device comprising a GPS receiver |
US20050021767A1 (en) * | 2001-08-13 | 2005-01-27 | Hong Cai | Keeping persistency while switching between modalities |
US20040203698A1 (en) * | 2002-04-22 | 2004-10-14 | Intel Corporation | Pre-notification of potential connection loss in wireless local area network |
US7203487B2 (en) * | 2002-04-22 | 2007-04-10 | Intel Corporation | Pre-notification of potential connection loss in wireless local area network |
US7610050B2 (en) | 2002-08-14 | 2009-10-27 | Tadaaki Chigusa | System for mobile broadband networking using dynamic quality of service provisioning |
WO2004017548A3 (en) * | 2002-08-14 | 2004-04-15 | Kataname Inc | System for mobil broadband networking using dynamic quality of service provisioning |
US7015809B1 (en) | 2002-08-14 | 2006-03-21 | Skipper Wireless Inc. | Method and system for providing an active routing antenna |
US20060071794A1 (en) * | 2002-08-14 | 2006-04-06 | Kataname, Inc. | Method and system for providing an active routing antenna |
US7801516B2 (en) * | 2003-05-29 | 2010-09-21 | Kyocera Corporation | Communication terminal out of range determination method, wireless communication system switching method and communication terminal |
US20100311423A1 (en) * | 2003-05-29 | 2010-12-09 | Kyocera Corporation | Communication Terminal Out of Range Determination Method, Wireless Communication System Switching Method and Communication Terminal |
US8145204B2 (en) * | 2003-05-29 | 2012-03-27 | Kyocera Corporation | Communication terminal out of range determination method, wireless communication system switching method and communication terminal |
US20040242218A1 (en) * | 2003-05-29 | 2004-12-02 | Kyocera Corporation | Communication terminal out of range determination method, wireless communication system switching method and communication terminal |
US20050186931A1 (en) * | 2003-09-30 | 2005-08-25 | Nokia Corporation | Receiver module comprising a wideband antenna |
US7676245B2 (en) * | 2003-09-30 | 2010-03-09 | Nokia Corporation | Receiver module comprising a wideband antenna |
US20050136911A1 (en) * | 2003-12-22 | 2005-06-23 | Samsung Electronics Co., Ltd. | Apparatus and method for mobile station-assisted optimization of a wireless network |
US8190145B2 (en) * | 2003-12-22 | 2012-05-29 | Samsung Electronics Co., Ltd. | Apparatus and method for mobile station-assisted optimization of a wireless network |
US20060109825A1 (en) * | 2004-11-19 | 2006-05-25 | Research In Motion Limited | Method and system for predicting service drop in a wireless network |
US8295838B2 (en) * | 2004-11-19 | 2012-10-23 | Research In Motion Limited | Method and system for predicting service drop in a wireless network |
US8700061B2 (en) | 2004-11-19 | 2014-04-15 | Blackberry Limited | Method and system for predicting service drop in a wireless network |
US20060168308A1 (en) * | 2004-11-30 | 2006-07-27 | International Business Machines Corporation | Selective suspension of real time data exchanges for unreliable network connections |
US7496371B2 (en) * | 2004-12-10 | 2009-02-24 | Nec Corporation | Portable terminal and portable terminal communication method |
US20060128450A1 (en) * | 2004-12-10 | 2006-06-15 | Toshiyuki Oda | Portable terminal and portable terminal communication method |
US7515544B2 (en) | 2005-07-14 | 2009-04-07 | Tadaaki Chigusa | Method and system for providing location-based addressing |
US7778149B1 (en) | 2006-07-27 | 2010-08-17 | Tadaaki Chigusa | Method and system to providing fast access channel |
US8160096B1 (en) | 2006-12-06 | 2012-04-17 | Tadaaki Chigusa | Method and system for reserving bandwidth in time-division multiplexed networks |
US20080261630A1 (en) * | 2007-04-23 | 2008-10-23 | Research In Motion Limited | Indicating user presence on a messaging network |
EP1986401A1 (en) | 2007-04-23 | 2008-10-29 | Research In Motion Limited | Indicating user presence on a messaging network |
US8396470B2 (en) | 2007-04-26 | 2013-03-12 | Research In Motion Limited | Predicting user availability from aggregated signal strength data |
US20080268816A1 (en) * | 2007-04-26 | 2008-10-30 | Research In Motion Limited | Predicting user availability from aggregated signal strength data |
US20100160784A1 (en) * | 2007-06-01 | 2010-06-24 | Koninklijke Philips Electronics N.V. | Wireless Ultrasound Probe With Audible Indicator |
US7933592B2 (en) * | 2007-08-14 | 2011-04-26 | International Business Machines Corporation | Cellular telephone signal monitoring method and system |
US20090047944A1 (en) * | 2007-08-14 | 2009-02-19 | Johnson Sandra K | Cellular telephone signal monitoring method and system |
US8462737B1 (en) * | 2008-06-27 | 2013-06-11 | Research In Motion Limited | System and method for a MIMO split-physical layer scheme for a wireless network |
US20110151799A1 (en) * | 2009-12-21 | 2011-06-23 | James Snider | Apparatus And Method For Detecting Communication Interference |
US8611847B2 (en) * | 2009-12-21 | 2013-12-17 | Continental Automotive Systems, Inc. | Apparatus and method for detecting communication interference |
US20110151791A1 (en) * | 2009-12-21 | 2011-06-23 | James Snider | Apparatus And Method For Maintaining Communication With A Stolen Vehicle Tracking Device |
US20110148610A1 (en) * | 2009-12-21 | 2011-06-23 | James Snider | Apparatus And Method For Compromised Vehicle Tracking |
US20110148712A1 (en) * | 2009-12-21 | 2011-06-23 | Decabooter Steve | Apparatus And Method For Determining Vehicle Location |
US20110151795A1 (en) * | 2009-12-21 | 2011-06-23 | D Avello Robert F | Apparatus And Method For Maintaining Communications With A Vehicle In The Presence Of Jamming |
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